Improved mode of dyeing cotton



item

ADOLPHE JEAN JAMES DANDIRAN', 0F MULHOUSE, FRANCE. teem Patent No. 85,912, dated Janua/ry 19, 1869 IMPROVED MODE'QI DYEING- COTTON, 8Lc.

The Schedule referred to in these Letters Patent and making part of the same.

To allwhom it concern:

' Be it known that I, ADOLPH'E J EAN 'JAMns n Annmsn, have invented Improvements in the Mode of Dyeing Cotton and otherVegetable Textile Materials and I do hereby de'clare that the following is-a full and exact description tnereof.

- 1 I have discovered that artificial colors in general, and

more especially those derived from coal, such as aniline violets, blues; and reds, possess the propertyof com.-

bining with 'madder-mordants 'on vegetablefibres or tissues previously dyed with madder or its derivatives.

Although the quantities of the artificial coloringniatters which can thus be absorbed are comparatively small, they sufiice to modify the original tints, and to produce finer and faster colors than can be economi cally obtained by any other process. 'In mixing the artificial color in solution with the 'madder or its derivatives, and then dyeing by a single operation, a certain loss of the dye-stuff is sustained.

Therefore (without excluding this mode of operating) I prefer, first, to dye the material with madder or its derivatives, and then, after scouring, (and even, if necessary, treating with chloride of lime in the usual manner,) to re-dye it in a fresh bath containing the artificial color. V

:A simple example will suffice to illustrate the modats openmcfi in all-possible applications of my invention.

Supposing, for instance, that it be desired to produce economically a violet shade, as'a substitute for that usually obtained with commercial alizarine of the best quality, I begin by weakening the mordants by, say,

twenty per cent, thus realizing a firstsaving of tinctorial matter, the oxidation, dunging, or other preliminary treatment of the mordants being efi'ected in the usual manner.

Instead of dyeing with alizarine, I dye with garancine, to which chalk may be added, in case of need, and instead of eight parts of alizarine, which would otherwise have been required, I employ only about five parts of garancine, thus realizinga further saving of threeeighths in weight of dye-stuff.

- This fresh saving, added to the previous one, gives a total economy of one-half in weight; that is to say, that instead of two parts of alizan'ne, I only use one part of garancine, which, as is well known, is a much cheaper product. The garancine-treatment being completed,.the textile material is thoroughly washed, (preferably on the wheel,) and is ready for the second dyeing-process.

I To this end, I place in avat, used solely'for this purpose, a sufficient quantity of cold water, and of a solution of from two to three parts of Hoiimanns ,sol-' uble violet for each thousand parts of the garanciue employed in the preceding operation.

1f so desired, this violet may be replaced by Perkins violet, or by'rosolane, but in larger proportions; or, again, bysoluble Lyons blue, or any other equivalent product. The textile materials, already dyed with the garancine, as above, are placed in the vat, the contents of which, after-having been left cold for some time, to induce a more-equal distribution of the violet through the fibres, are rapidly carried to the boiling-point. The

ebullition is kept up for from about ten to thirty min utes, according to circumstances, and the dyed goods being then Withdrawn, are washed, and treated with chloride of lime in the usual way.

The second dyeing, thus performed, also exercises a cleansing-action, and produces the same effect as the boiling-rinse to which alizarine-violet goods are usually submitted.

The materials then undergo a soap scouring in cold What I claim, and desire to protect by Letters Patout, is-

The application of artificial-colors in general, and

more especially those derived from coal, (such as aniline violets, blues, and reds,) in combination with mad-- der-mordants, on cotton and other vegetable textile materials previously dyed with madder or its derivatives, substantially in manner and for the purposes herein specified.

.ADOLPHE J. J. DANDIRAN.

Witnesses:

, M. F. Mnunous, Patent Solicitor, Pam's.

T. BESANQON, Clerk to the above. 

